Previous version of an application will be deleted(replaced) when upgrading to a newer version ?

As the subject clearly states: what happens to old version of an app when upgraded to a newer version ?
does it works like the iphone app.. the old will be replaced with the newer or does the application file keep all the files including previous things?
If so, is it better to restore macbook pro rarely ?
thanx a lot

The old version is uninstalled and the new version is installed.
I can't think of a reason to ever do a restore other than before selling it.
Even for a failed and replaced hard disk I would reload from my most recent backup.

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